Gas range



June 17, 1930. s. H. HOBSON 1,763,705

GAS RANGE Filed June is, 1927 2 sheetssheet 1 June 17, 1930. H, HOBSON 1,763,705

GAS RANGE Filed June 13, 192? 2' Sh eets-Sheet 2 Patented June 17, 1930 warren smrss ra'rsu'r orrica STANLEY H. HOBSON, OF ROCKFORD, ILLINOIS, ASSIGNOR TO GEO.- D. ROPER CORPORA- 'IION, or ROCKFORD, ILLINOIS,

A CORPORATION or ILLINOIS.

GAS RANGE Application filed; June 13,

This invention relates to gas ranges and is more particularly devoted to an improved closed top stove so designed and constructed that the use of four or more burners, in front and rear sets, is rendered thoroughly practical and about the same operating efiiciency is secured as with an ordinary open top stove.

Experiments on the present stove showed that the back burners were supplied with too much secondary airv because of their close proximity with the outlet to the fiue, whereas the front burners were not supplied with quite enough. This tendency was observed when the closed cooking top was allowed to exhaust directly into a flue of a size suflicient for conducting the productsof combustion from the oven section. According to the pressent invention this difficulty is remedied when the flue conduits for the cooking top and for the oven section are determined separately to suit the particular requirements in the two cases. A perfectly balanced operation of all of the cooking top burners is thus obtained when a slight flue restriction is made therefor.

Any tendency for the flue to become choked with products of combustion due to the restriction, I have found is entirely avoided by locating the outlet end of the closed top flue conduit directly beneath the intake end of the flue to make available the good draft provided thereby.

The present improvements are clearly illustrated in the accompanying drawings where- Figure 1 is a view of. the back of a gas stove having flue connections in accordance with my invention; and

' Fig. 2 is a vertical section taken on the l1ne 2-2tr Fig. 1 looking in the directionof the arrows.

The invention, is illustrated as applied to gas ranges of the cabinet type, consisting of an oven section 5 provided at one side of a closed cooking top 6. The latter has the usual splashe'r wall 7 and top shelf 8. The drip pan 9 beneath the closed top provides a secondary air chamber 10 for the burners 11 arranged beneath a distributor plate 12 in accordance with the disclosure in my co-pending appllcatiou, Serial No. 193,276, filed May 21, 1927.

'through the gular form, tapering 1 927. Serial-No. 198,462.

I 12 has openings 13 providing communication between thesecondary air chamber 10 and a combustion chamber 14. The burners 11, which are supplied with primary airand gas manifolds 15 in the usual manner and have connection through cocks 16 with the front manifold pipe 17 are arranged to project the flames therefrom through the openings 13 toward the cooking top. Sec

ondary air is drawn with the flames through the openings into the combustion chamber 14, as fully set forth in said applica ion, the waste products. of combustion being arranged to travel rearwardly and out of thecombustion chamber through an elongated exhaust opening 18 leading into a neck 19 communicating 1 with the lower end of a flue conduit 20. EX- periment on the present stove has shown that in the absence-of a specially designed flue as herein contemplated, the back burners on account of being closer to the flue outlet are supplied with too much secondary air and the front burners not quite enough. This difficulty was observed even though all other conditions, as regards design and construction in the cooking top itself, were' proper to secure perfect combustion at the several burners. Upon analysis it appeared that the trouble was due to the fact that the full sized flue used for the oven section afforded a draft too heavy for the closed top and that a smaller flue would have to be provided therefor. This would, offhand, appear to dictate the necesdifferent Way according to the present invention as described hereinafter.

Theneek 19 to which the flue conduit 20 is connected extends through the burner box backwall 21 as indicated. Bolts 22 serve to fasten the flanged lower end of the conduit 20 to the neck 19. The conduit 20 is preferably but not necessarily of an aproximately trianfrom a comparatively 23 of nearly the full top to a relatively reend 24 communicating wide lower inlet end Width of the cooking stricted upper outlet with the flue proper, shown at 25. The comlUU lnunication of the conduit with the flue is-afforded through the end-of a manifold or intermediate conduit 26 as clearly appears in Fig. 2. The flue 25 is of appreciably larger cross-sectional area than the outlet end 24 of the conduit 20 as will be readily apparent. The capacity of the-conduit is determined accurately to suit the requirements of the closed top whereas that of the flue 25 is determined to suit the requirements of the oven section 5. The latter has connection through an outlet opening 27 and neck 28 with the conduit 26 and through the latter with the fine 25. The restriction of the outlet end of the conduit 20 does not cause a sluggish flow of the waste products of combustion from the closed top because .of the fact that the outlet end 24 of the conduit is disposed directly beneath the inlet end of the flue 25 and hence is subject to the good draft provided thereby.

In operation it is found that the flue connections just described result in perfect combustion at both the front and the back burners at all loads from the lowest to the highest. There is never any evidence of floating, due to too much or not enough secondary air reaching the burner flames. Furthermore, it will be apparent that the construction and arrangement are simple and inexpensive and easy to assemble.

I have illustrated the use of shields at 29 and 30 covering the conduits 20 and 26 respectively. These shields are mounted on the backs of the conduits in spaced relation thereto as by means of spacers 31 and bolts 82. When shields are provided in this way the stove may be placed close to the Wall without danger of scorching the same. This is obviously due to the fact that air is free to circulate between the back of the conduits and the shields.

I claim:

1. A gas range having a closed cooking top, ashallow combustion and flue chamber beneath the cooking top to which air is admitted only through secondary air openings and having a relatively Wide outlet opening across one end, Bunsen burners arranged so that their flames project through said sec ondary air openings and entrain secondary air for supporting combustion for heating the cooking top, an upright flue conduit having its lower end corresponding in area and connected to the said outlet opening and having its upper end restricted to provide an outlet opening of predetermined area, and a flue structure into which said restricted outlet end of the upright flue discharges and which is adapted to be connected to a chimney or conduit for carrying the products of combustion away, said flue structure having an inlet opening separate from the upright flue communicating with the atmosphere, the area of said restricted outlet opening being so proportioned with respect to the secondary air inlet openings of the combustion chamber as to effect a balanced elimination of products of combustion without excess of secondary air entrainment under varying draft and atmospheric conditions.

2. A gas range as set forth in claim 1, including an oven and in which the inlet opening in the flue structure separate from the upright flue communicates with the atmosphere through the intermediary of the flue for carrying the products of combustion from the oven, and which flue discharges into the fine structure defined in said claim.

In witness of the foregoing I aflix my signature.

STANLEY H. HOBSON. 

